Gordon Buchanan completes his equatorial journey in Southeast Asia. He reveals evidence that Indonesia's capital, Jakarta, is sinking, and discovers how drones are helping to manage a dangerous conflict between elephants and farmers in Sumatra. In areas of Borneo afflicted by deforestation, he searches for orangutans at night, and helps the veterinarian team health-check orphaned apes at the rehabilitation centre in Sepilok, Malaysia. Finally, he finds out how aerial tech offers hope for endangered Siamese crocodiles